you’d have to create a place in the system.
if you don’t already have a source for the KML file to create the place, probably the easiest way to get one is to export the place from OpenStreetMap via overpass turbo.
based on the process described here: https://forum.inaturalist.org/t/how-to-import-a-place-from-openstreetmap-into-inaturalist-using-overpassturbo-web-based/41046, the overpass script you would need to get the boundaries of the place would be:
relation(537593);
out;
>;
out skel;
